AC-DC power supply conversion chip and power switching circuit
A power conversion circuit and chip technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve the problems of DC voltage accuracy and low load adjustment rate, and achieve the effect of improving accuracy and load adjustment rate
Active Publication Date: 2013-04-17
SHENZHEN FM ELECTRONICS GRP CO LTD
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[0003] The purpose of the embodiment of the present invention is to provide an AC-DC power conversion chip, aiming to solve the problems of low output DC voltage accuracy and load regulation rate of the existing AC-DC power conversion chip
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] The embodiment of the present invention uses the output load compensation circuit to perform error amplification and comparison between the feedback voltage after correction and the reference voltage, so as to achieve different modulation signals under different DC output current loads, so as to improve the accuracy of the output DC voltage and the load adjustment rate .
[0028] figure 1 The structure of the AC-DC power conversion chip provided by the embodiment of the present invention is shown, and for the convenience of description, only the parts related to the present invention are sh...
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The invention is suitable for the integrated circuit field and provides an AC-DC power supply conversion chip and a power switching circuit. The chip comprises: a reference unit, which is used for providing a reference; a comparison unit, which is used for comparing a detection signal to the reference and outputting a switch control signal; a load compensation unit, which is used for carrying outload compensation according to a feedback signal and outputting a compensation voltage; an error amplification unit, which is used for comparing the compensation voltage to the reference and outputting a frequency control signal, wherein the load compensation unit corrects the compensation voltage according to the frequency control signal; a modulation unit, which is used for adjusting a frequency of a PFM signal according to the frequency control signal and adjusting a duty ratio of the PFM signal according to a comparison control signal. In the invention, through the load compensation unit,a feedback voltage value is adjusted and then is compared with a second reference voltage so that the different PFM signals are generated under the conditions of different output current loads. An output direct voltage can be adjusted. Precision of the output voltage and load regulation can be raised.
Description
technical field [0001] The invention belongs to the field of integrated circuits, in particular to an AC-DC power conversion chip and a power conversion circuit. Background technique [0002] At present, with the rapid development of integrated circuits, power conversion chips and power conversion circuits are widely used in chargers, adapters, lamps and various precision instruments, and more and more application fields require power conversion chips and power conversion circuits. The accuracy requirements of the output DC voltage have also increased accordingly, but the current output DC voltage accuracy of the traditional AC-DC power conversion chip can only reach 8%, and the load regulation rate is low, which is far from meeting the application requirements of various fields. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide an AC-DC power conversion chip, aiming at solving the problems of low output DC voltage acc...
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IPC IPC(8): H02M7/04H02M3/335H02M1/14
Inventor 吴飞
Owner SHENZHEN FM ELECTRONICS GRP CO LTD